KR101223035B1 - Method and apparatus for providing safe velocity of a vehicle and using the information - Google Patents

Abstract

The present invention provides a safe speed for a dangerous section due to slippage or the like on a road. One method according to the present invention, in the received traffic information signal, to decode the safety speed for limiting the speed of the vehicle for any section of the road and the location information for the arbitrary section, and the current position information obtained continuously If is in the arbitrary section, the driving speed of the vehicle is forcibly adjusted to the received safety speed or less.

Traffic Information, Danger Zone, Slip, Safe Speed, Control, Deceleration, TPEG

Description

Method and apparatus for providing safe velocity of a vehicle and using the information}

1 is a simplified view of a network provided with traffic information including a safe speed according to the present invention,

2a illustrates a format for providing traffic information transmitted wirelessly;

FIG. 2B illustrates the syntax in which the RTM event container or TPEG location container of FIG. 2A is configured.

3A illustrates an example of a transmission structure of information on a road condition included in an RTM event container, based on transmission of safety speed information, according to an embodiment of the present invention.

3b illustrates a structure of transmitting location information for a section in which a safe speed included in a TPEG location container is designated according to an embodiment of the present invention;

3c illustrates a structure of transmitting location information for a section in which a safe speed included in a TPEG location container is designated according to another embodiment of the present invention;

FIG. 4A shows the syntax of the safe speed in the RTM component of FIG. 3A, and FIG.

FIG. 4B shows a syntax for link information carried in the RTM component of FIG. 3C.

5 illustrates a configuration of a terminal according to an embodiment of the present invention, mounted on a vehicle or the like, for receiving traffic information transmitted from a server,

6 is a flowchart of a speed control method based on a received safe speed according to an embodiment of the present invention;

7 illustrates an example of a virtual link shape for showing that link information is advantageously used to determine whether the vehicle belongs to a safe speed designation section.

Description of the Related Art [0002]

1: tuner 2: demodulator

3: TPEG decoder 4: storage

5: main control unit 6: LCD drive

7: LCD panel 8: GPS module

9: input unit 10: vehicle control unit

100: server

The present invention relates to a method and apparatus for providing traffic information on a road and using the provided information.

Today, with the development of digital signal processing and communication technology, radio and TV broadcast signals that provide content wirelessly are gradually provided in the form of digital data. By providing the signal in digital form, it is possible to provide a variety of information to the TV or radio broadcast signal, such as news, securities, weather and traffic information.

In particular, with the increase of vehicles in the city center and the increase of holiday vehicles such as holidays, the necessity of traffic communication information on the road is increasing day by day. For this reason, a method of providing road traffic information as additional information through satellite broadcasting, terrestrial broadcasting, or mobile communication network is being developed.

However, the provision of such traffic information is currently focused on helping drivers to select roads or routes by providing traffic conditions on the road (for example, communication, congestion, and delays). In order to cope with the change of the situation, for example, the slippage of the road, there is no way to allow the driver to safely drive the danger section.

SUMMARY OF THE INVENTION An object of the present invention is to propose a method of providing a safe driving speed for a dangerous section to a driver traveling on a road.

Another object of the present invention is to provide a method and apparatus for controlling a traveling speed in accordance with a provided safety speed.

One method of encoding traffic information according to the present invention comprises the steps of generating event information including a safe speed for limiting the speed of the vehicle for any section on the road, and generating location information for the section. And generating a traffic information message including the event information and location information.

One method of decoding traffic information according to the present invention comprises the steps of: extracting a traffic information message from a received signal; and in the extracted traffic information message, a safe speed for limiting the speed of the vehicle for any section on the road; And extracting event information including location information and location information of the random section.

In one embodiment according to the present invention, the safety speed is set for the corresponding section in the case of slippage in the road surface state, for example, rain, snow, ice, etc. is transmitted as traffic information.

In one embodiment according to the invention, the safety speed is carried on a component for transmitting information on the road surface condition, the adhesion of the road surface.

In one embodiment according to the present invention, if there is a reference (for example, weight or height) for which the safe speed is calculated, the reference information is transmitted together with the safe speed.

In one embodiment according to the present invention, the location information is configured to include the longitude and latitude coordinates corresponding to the start point and the end point of the arbitrary section, or comprises link information for the arbitrary section.

In another embodiment according to the present invention, the location information includes latitude and longitude coordinates corresponding to the start point and the end point of the random section, and information on a link to which the random section belongs.

In one embodiment according to the present invention, the deceleration facts are visually and / or audibly guided to the driver when decelerating the traveling speed of the vehicle in a designated section according to the safety speed.

In one embodiment according to the present invention, when the vehicle's driving speed is lowered below the safety speed, and the vehicle is out of the section specified in the position information, the driver may visually restore the driving speed to the state before deceleration. And / or audio guide.

In one embodiment according to the present invention, if the reference information for the safe speed is further received, the actual safe speed is calculated from the safe speed based on a proportional amount of the setting information of the vehicle corresponding to the reference information and the reference information. Use it as a guideline to adjust the speed of your car.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a simplified diagram illustrating a network in which traffic information is provided according to the present invention. In the network of FIG. 1, for example, the traffic information providing server 100 of a broadcaster is collected from various paths, for example, operator input, another server or a probe car via the network 101. Various congestion traffic information and road conditions (road conditions, etc.) are reconstructed for each section and transmitted wirelessly so that a traffic information receiving terminal, for example, a navigation terminal, mounted on the vehicle 200 can receive them.

The traffic information providing format that the traffic information providing server 100 transmits wirelessly is a sequence of message segments (hereinafter, referred to as 'TPEG (Transport Protocol Export Group) messages') as shown in FIG. 2A. One message segment, TPEG-RTM (Road Traffic Message) message, which transmits road situation information in the sequence, includes a message management container (21), an RTM event container (22), and a TPEG location. It consists of a container (TPEG Locatoin Contaioner) 23. Another message segment in the segment sequence may be a Congestion and Travel-Time information (TPEG-CTT) message 30 for conveying traffic information other than road conditions, for example road traffic information (congestion information). have. Providing the road traffic information through the message segment is not relevant to the present invention, and a description thereof will be omitted.

In the message management container, information such as the date and time and the time of occurrence of the message are carried, and the event information on the road situation that requires attention is loaded in the RTM event container. Information about is posted in the RTM event container. The TPEG location container carries information on an arbitrary section of the road on which a safe speed is designated.

The present invention is to provide a safe speed according to the state of the road surface, in particular a sliding state, in the following description of the configuration and transmission of information on the safe speed and the section in which the safe speed is specified, and according to the configuration information The operation and the like will be described. As described above, the configuration of the technology or additional information required for the implementation of the present invention may be one of various methods for providing road situation information.

Both the RTM event container and the TPEG location container are composed of one or more RTM components 201, as shown in FIG. 2B, where each RTM component is 0x8X (X = 0-9) when carrying road situation information. It has an identifier of and has an identifier of 0x90 when carrying location information. The safety speed according to the sliding state on the road provided according to the present invention is transmitted in the embodiment according to the present invention by carrying it on the RTM component of the identifier 0x83, as shown in FIG. 3A. Of course, it can be inferred by the person skilled in the art according to the following description that it is carried on a component having a different identifier and transmits it in a form different from that described below. Transmission is not deemed to be beyond the scope of the present invention.

If the server 100 determines that the road surface condition of a particular section on the current road is dangerous due to rain, snow or ice, irregularities, etc., the safety speed information and the like for the section are illustrated in FIG. 3A. Loaded in conditional component 301, packed into RTM component 302 with an identifier of 0x83 and sent. Specifically, the road condition component 311 with the identifier 0x01 includes information on the road surface condition of the danger zone (for example, uneven, pot hole, loose surface, rock fall). ), And information about the magnitude of the road surface (eg, light, medium, severe, very severe, etc.), identifier 0x02 The road condition component 312 of the unit includes information that affects the frictional force between the road and the vehicle tires (eg, oil spills, snow, slip, rain, etc.) and the magnitude of the effects. Include information about The server 100 may include one of the two components 311 and 312 described above in the RTM component 302 according to a road condition. Then, the information on the safety speed according to the road condition included in the component, according to the grammar shown in Fig. 4a, configures the road condition component 313 of identifier 0x04 as shown in Fig. 3a and loads it on the traffic information. send.

, 여기서, μ는 도로 표면의 미끄럼에 따른 마찰계수, g는 중력가속도, R은 해당 구간의 반지름이다. )의, 예를 들어 50%를 안전속도(Vs=0.5Vc)로 지정한다. 또 다르게는 상기 서버(100)의 운영자가 특정 구간에 대한 안전속도를 직접 입력하여 도 3a와 같은 형태로 제공되도록 할 수도 있다. 한편, 하나의 위험 구간에 대해, 안전속도를 실은 컴포넌트(313)가 반드시, 전술한 도로 표면상태의 컴포넌트(311) 또는 도로 마찰력 상태의 컴포넌트(312)와 동반되어 전송될 필요는 없다.The safe speed that the server 100 loads on the road condition component 313 of identifier 0x04 and transmits the road surface state, for example, when the road speed state is a safe speed for unevenness, etc., is recognized by the driver before driving. In the case of information on the road friction force, that is, the sliding, etc., the speed is such that the road section can be safely driven without slipping. This safety speed is automatically calculated by the server 100 according to the manner given for the information on the road surface conditions or road frictional forces to be collected. One example of automatically calculating the safety speed according to sliding is the speed at which the centrifugal force according to the curvature of the section and the centripetal force due to the frictional force of the road surface coincide (

Where μ is the coefficient of friction according to the sliding of the road surface, g is the acceleration of gravity, and R is the radius of the section. For example, 50% is designated as the safe speed (Vs = 0.5 Vc). Alternatively, the operator of the server 100 may directly input a safe speed for a specific section to be provided in the form shown in FIG. 3A. On the other hand, for one dangerous section, the component 313 carrying the safe speed does not necessarily need to be transmitted with the above-described road surface component 311 or road frictional component 312.

The server 100 may additionally include the reference information 313b in the component 313 of the safe speed if necessary in addition to the safe speed 313a for the current danger section. When reference information 313b is not needed, a value of '0' is recorded in the corresponding field 401 of FIG. 4A. The reference information may be a reference weight or a reference height for which the safe speed to be transmitted is calculated, and the terminal receiving the safe speed may have a ratio with respect to the received reference information of the weight of the vehicle or the height of the center of gravity set to the terminal. Alternatively, the actual safety speed of the vehicle with respect to the received safety speed may be calculated based on the square root of the ratio.

On the other hand, the server 100 is to transmit the location information for the danger zone is specified in the safe speed is loaded on the TPEG location container. 3B illustrates an example of a structure of transmitting location information for a section in which a safe speed is designated according to an embodiment of the present invention. As shown, the server 100 mounts and transmits one or more TPEG location components (Tpeg_loc_component) 330 to the RTM component 322 with an identifier of 0x90. Each TPEG position component carries a location co-ordinate having an identifier of 0x00. One or more coordinate components are mounted on the position coordinate information.

Each coordinate component has various information according to its identifier, for example, a link (a road unit means a road section having no branching point inside.), Identification information of longitude and latitude coordinates of the link, and a shape point of the link. (vertex) information, link type information, link description information, etc. may be carried. Since the present invention transmits position information on a section of a safe speed, the structure of the section position transmission is illustrated in FIG. 3B. The description of the transmission of the various information as described above is omitted, and only the contents related to the location information transmission for the section of the safe speed will be described in detail.

As shown in FIG. 3B, one coordinate component 331 that transmits information about a danger section includes information about a location type 341, a latitude and longitude coordinate 342 for a start point of the danger section, and a danger section. The latitude and longitude coordinates 344 for the end point are loaded. In the information 341 for the location type, a value indicating a segment, for example, a value of 3 is recorded. In the notation used in the drawings or the description of the invention, 'locNN_kk' ('NN' and 'kk' are both numbers) is a table specified as 'locNN' (this is common between the server 100 and a terminal receiving the same). A table defined or applied to a program according to the definition, etc.) indicates the value of 'kk', and the meaning of kk is interpreted as defined in the locNN table. For example, 'loc01_03' in FIG. 3B assumes that 03 is defined as indicating a section in the loc01 table. The value of the form of 'locNN_kk' not specifically mentioned in the description of the present invention is the value of kk in the previously known table of locNN and its meaning.

In addition, the coordinate component 331 may further include text information 343 and 345 describing a point about a start point and an end point.

Correlation between the information on the road condition transmitted by the RTM component and the section position information transmitted by the coordinate component is explained by the order of each component and the transmission order of the corresponding information on the component. For example, the road condition component (s) in the RTM component of the first identifier 0x83 is correlated with the first coordinate component in the RTM component of the first identifier 0x90.

In another embodiment according to the present invention, as shown in FIG. 3c, the information 350 about the link to which the section belongs is additionally loaded in the location information about the danger section. 4B illustrates syntax for additionally loaded link information. According to the grammar of FIG. 4B, the link information included in the coordinate component of the identifier 0x10 is composed of an ID type 351 and a link ID 352. Link ID is a number or code that uniquely identifies a link in all areas where traffic information is served. Link ID is a type of service provider or country used to assign a link ID. Indicate the value to indicate. In the embodiment of FIG. 3C, if the entire section of the link specified by the link ID is a dangerous section, the latitude and longitude information of the start point and the end point for the section designation may not be included in the location co-ordinates. have. The ID of the link and information about its location and shape may be pre-stored in a terminal that receives traffic information, or alternatively, may be transmitted through a separate TPEG location container.

FIG. 5 illustrates a configuration of a terminal according to an embodiment of the present invention, mounted on a vehicle or the like, which receives the traffic information configured and transmitted from the server 100 as described above. The terminal 50 of FIG. 5 includes a tuner 1 for tuning a signal band provided with traffic information and outputting a modulated traffic information signal, and a demodulator 2 for demodulating the modulated traffic information signal and outputting a traffic information signal. ), A TPEG decoder (3) for decoding the demodulated traffic information signal to obtain traffic information including various road traffic information and information on danger zones, and receiving a satellite signal transmitted from a plurality of low-orbit satellites, GPS module 8 for grasping longitude, latitude, and altitude; a storage means 4 for storing various graphic information and temporarily storing necessary information; an input unit 9 for receiving user input; and a user input. The main controller 5 for controlling the screen output based on the current position and the obtained traffic information, calculating the information necessary for speed control, and transmitting the calculated information to the vehicle controller 10, and the LCD for displaying an image. A panel 7, an LCD drive 6 for applying a driving signal according to a graphic to be displayed to the LCD panel 7, and a vehicle controller for controlling a transmission and an accelerator pedal according to the detected speed and received speed control information ( 10) is included. The input unit 9 may be a touch screen provided on the LCD panel 7.

The tuner 1 tunes a signal transmitted from the server 100, and the demodulator 2 demodulates and outputs the tuned signal in a predetermined manner. Then, the TPEG decoder 3 extracts and temporarily stores the input demodulation signal, which is configured and transmitted as shown in FIGS. 2A and 2B, 3A and 3B or 3C, and 4A and 4B. Each temporary TPEG message is interpreted and the necessary information and / or control data according to the content of the message are transmitted to the main controller 5. Although various information (such as the current communication state on each link) and / or control data are transmitted from the TPEG decoder 3 to the main control unit 5, the present invention provides a safe speed for a dangerous section and accordingly the terminal. This is for the corresponding operation of the following will be described in detail for the operation to process the safe speed of the vehicle.

The TPEG decoder 3 extracts the date / time and the message occurrence time in the message management container of each TEPG message, determines whether a subsequent container is an RTM event container from the information of the 'message element', and the road in the container. Information obtained from the conditional components 301 is transmitted to the main controller 5. In addition, location information corresponding to the road condition component (s) carried in the currently transmitted RTM component is obtained from a subsequent TPEG location container. Of course, information about road conditions on other components in the RTM event component is also transmitted to the main control unit 5 to provide appropriate processing, for example information on obstacles, road conditions, slippage, etc. for a particular road segment. An operation to display on (7) is performed, but since this is not directly related to the present invention, further description of the processing of such information is omitted.

6 is a flowchart illustrating a speed control method based on a safe speed according to an embodiment of the present invention. If the information obtained from the TPEG decoder 3 contains information on the safe speed, the main control unit 5 provides location information on the section in which the safe speed is designated, that is, the latitude and longitude coordinates of the start point and the end point of the section. Figure out first (S60). If the position information is found, the latitude and longitude coordinates of the current position received from the GPS module 8 are continuously compared (S62). If the current latitude and longitude coordinates lie on the section designated by the latitude and longitude coordinates of the starting point and the end point, the main control section 5 provides the vehicle control section 10 with the safe speed designated for the section.

The vehicle control unit 10 stores the information about the current shift state and the accelerator pedal state ifo2 when the safety speed is received and is higher than the safety speed in comparison with the currently detected vehicle speed ifo1. At step S64, the transmission and / or the accelerator pedal are appropriately controlled to reduce the speed of the vehicle below the received safety speed and maintain the speed (S66).

In another embodiment according to the present invention, the driver may selectively activate the above operation to reduce the current vehicle speed to less than the received safety speed through the input unit 9. As such, when the speed control operation according to the safe speed is selectively performed, the main control unit 5 displays the activated state on the LCD panel 7 when the driver is activated.

On the other hand, as described above, when decelerating the speed below the received safety speed, the deceleration fact is displayed on the LCD panel 7, or when a speaker (not shown) is provided, the voice is digitized and stored. Sound source).

In the state where the vehicle is traveling below the safe speed according to the deceleration, the current position received from the GPS module 8 continuously goes out of the designated danger section (the section between the received point and the longitude and latitude coordinates). In operation S68, the main controller 5 transmits a release signal to the vehicle controller 10 when it leaves the corresponding section. Accordingly, the vehicle control unit 10 controls the transmission to adjust gradually to the stored shift state and the accelerator pedal state and adjusts the accelerator pedal (S70). Upon completion of this control / adjustment state (or just before beginning the action of restoring to the stored shift state and the accelerator pedal state), the driver is informed visually and / or audibly.

In another embodiment according to the invention, instead of the adjustment of the accelerator pedal, it is also possible to directly adjust the opening information of the throttle valve for controlling the amount of fuel injected into the engine. In the present embodiment, during the forced adjustment of the speed, the possibility of maintaining the speed above the safety speed by the driver in the danger zone can be eliminated by releasing the connection portion between the accelerator pedal and the throttle valve.

According to the embodiment of FIG. 3C, when the information on the link ID is received in addition to the information on the position of the start point and the end point of the danger section, the coordinate value of the current position received from the GPS module 8 is received. It is additionally determined whether the position belongs to the link indicated by the link ID. Information on the shape of the link specified by the link ID (set of latitude and longitude coordinates of the vertices of the link) is stored in the storage means 4 or received from the server 100 and stored in the storage means ( It is stored in 4). In this way, if additionally confirming whether the current position belongs to the link designated by the link ID, it is possible to eliminate the possibility that an error may occur in determining whether the current position belongs to a safe speed section in a severely curved section.

For example, as shown in FIG. 7, when a specific section RS: SS to SE of the first link nn becomes an icy road due to local reasons such as water pipe freezing, the latitude and longitude coordinates designating the section RS are used. The section designated virtually becomes VS. Of course, considering the error of the longitude and latitude coordinates calculated from the GPS signal, the virtual section in which the safe speed is designated becomes the B region. In this situation, if the vehicle enters the B area at the EP1 or EP2 point while driving along the second second link (mm), it is determined that it belongs to the designated danger zone, and the speed can be forcibly limited to the safe speed. In this case, if the ID of the received link is compared to the danger section, the ID of the currently running link is mm, whereas the ID of the link received for the danger section is nn so that it is accurately determined as not the danger section. The driving speed is not forcibly adjusted.

(여기서, Vs는 수신된 안전속도이다. )가 되어 상기 차량 제어부(10)에 전달된다. 기준정보와 설정된 대응정보의 비율대신, 그 비율의 제곱근 또는 세제곱근에 해당하는 비를 실제 안전속도를 구하는 데 사용할 수도 있다. 즉,

또는

에 의해 구할 수도 있다. 이 들은 기준정보와 실제 설정된 대응정보에 근거하여 수신된 안전속도로부터 실제 적용할 안전속도를 구하는 단순한 예에 지나지 않으며 기 공지된 다양한 방식에서 적절한 비례량을 구하는 식을 선택하여 사용할 수 있다.When the information received from the TPEG decoder 3 contains the reference information, the main control section 5 determines the currently set corresponding information (for example, the weight of the vehicle or the height from the ground of the center of gravity) of the reference information. The speed control may be performed as described above by obtaining a ratio with respect to the speed, and using the speed of the obtained speed as the actual safety speed of the vehicle. That is, when the value of the received reference information is R and the value of the corresponding response information is CR, the actual safety speed Vas set for the speed control for the vehicle is

(Vs is the received safety speed.) And is transmitted to the vehicle control unit 10. Instead of the ratio of the reference information and the corresponding corresponding information, the ratio corresponding to the square root or cube root of the ratio may be used to obtain the actual safe speed. In other words,

or

Can also be obtained by. These are merely examples of obtaining a safe speed to be actually applied from the received safe speed based on the reference information and the actual corresponding information, and can be used by selecting an appropriate proportional amount in various known methods.

On the other hand, the driver may directly input a corresponding value to the corresponding information of the reference information set in the main control unit 5, the main control unit 5 is known to board a variety of types of vehicles and their vehicles After providing the driver with a screen to select the number, gender, age and boarding position of a person, the vehicle's weight and / or center of gravity are automatically calculated and set according to the selected information, It can also be used for calculation.

As mentioned above, preferred embodiments of the present invention described above are disclosed for the purpose of illustration, and those skilled in the art can improve other various embodiments within the spirit and technical scope of the present invention disclosed in the appended claims below. Changes, substitutions or additions will be possible.

At least one embodiment of the present invention described in detail above, it is possible to prevent traffic accidents that may occur in the danger zone due to the carelessness of the driver or excessive confidence in driving, thereby reducing the loss of life and property.

Claims (19)

In the encoding method of traffic information, Generating event information including a safe speed for limiting the speed of the vehicle according to a temporary condition of an arbitrary section of the road; Generating location information on the random section; It includes a step of generating a traffic information message including the event information and location information, The temporary condition includes a degree of sliding of the road for the arbitrary section, The safe speed is,

Where μ is the coefficient of friction according to the sliding of the road surface, g is the acceleration of gravity, R is the radius of the interval. The method of claim 1, The event information further comprises reference information to which the safe speed is applied. 3. The method of claim 2, Wherein said reference information is weight or height. The method of claim 1, The location information includes latitude and longitude coordinates for the start point and the end point of the arbitrary section. The method of claim 1, The location information includes information about a link to which the arbitrary section belongs. In the traffic information decoding method, Extracting the traffic information message from the received signal; In the extracted traffic information message, comprising the step of extracting the event information including the safety speed for limiting the speed of the vehicle according to the temporary conditions of the arbitrary section on the road and the location information for the arbitrary section, The temporary condition includes a degree of sliding of the road for the arbitrary section, The safe speed is,

Where μ is the coefficient of friction according to the sliding of the road surface, g is the acceleration of gravity, R is the radius of the interval. The method according to claim 6, Acquiring current location information and adjusting the traveling speed of the vehicle to be less than or equal to the safe speed if the acquired current location belongs to the arbitrary section. 8. The method of claim 7, Acquiring the current position information in the state of adjusting to the safe speed or less and restoring the driving speed of the vehicle to the speed before adjusting the speed below the safe speed if the obtained current position is out of the random section; Method. The method according to claim 6, The extracted event information further includes reference information to which the safe speed is applied. 10. The method of claim 9, Wherein said reference information is weight or height. The method according to claim 6, The extracted location information includes latitude and longitude coordinates of the start point and the end point of the arbitrary section. The method according to claim 6, The extracted location information includes information about a link to which the arbitrary section belongs. An apparatus for decoding traffic information, A decoder for extracting and decoding event information including a safety speed for limiting a speed of a vehicle according to a temporary condition of an arbitrary section on a road and location information of the arbitrary section from a received traffic information message; A receiver for obtaining information about the current position, It includes a control unit for adjusting the running speed of the vehicle based on the safe speed and position information decoded by the decoder, and the current position obtained by the receiver, The temporary condition includes a degree of sliding of the road for the arbitrary section, The safe speed is,

Wherein μ is the coefficient of friction according to the sliding of the road surface, g is the acceleration of gravity, R is the radius of the interval. 14. The method of claim 13, The controller stores the information related to the current traveling speed of the vehicle when the obtained current position belongs to the arbitrary section, and adjusts the traveling speed to be less than or equal to the safe speed. If out of the random section, the device to adjust the running speed of the vehicle at a speed based on the information related to the stored running speed. 14. The method of claim 13, The control unit informs the driver of the fact through the output means when the running speed of the vehicle is adjusted according to the safe speed. 16. The method of claim 15, The information output through the output means is visual and / or audio information. 14. The method of claim 13, When the reference information on the safety speed is further decoded from the event information, the controller calculates an actual safety speed from the safety speed based on a proportional amount of the setting information of the vehicle and the reference information corresponding to the reference information. The device is to be used as a reference for the speed adjustment of the. 14. The method of claim 13, And the decoded position information includes latitude and longitude coordinates of a start point and an end point of the arbitrary section. 14. The method of claim 13, And the decoded position information includes information about a link to which the arbitrary section belongs.

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